Schuyler s



s. 3. WHEELER. ELECTRICAL SPOOL.

(No Model,)

No. 480,681. Patented Aug. 9, 1892.

UNITED QTATES l ATENT ()FFIGE.

SOHUYLER S. WHEELER, OF NEW YORIQN. Y., ASSIGNOR TO THE CROCKER- WHEELER ELECTRIC COMPANY, OF SAME PLACE.

ELECTRICAL SPOOL.

SPECIFICATION forming part of Letters Patent No. 480,681, dated August 9, 1892.

Application filed December 80, 1891. Serial No. 416,531. (No model.)

To all whom it may concern: Be. it known that I, SOHUYLER S. WHEELER, a citizen of the United States, residing at New York, in the county and State of New York, 5 have made a new and useful Improvement in Spools for Electro-Magnets, of which the following is a specification.

My invention is directed particularly to the sleeve or spool portion of an electro-magnet which surrounds the core thereof and maintains or secures the windings of the coil in position; and its objects are, first, to produce such a sleeve or spool as will be simple, cheap, and quickly or easily made second, to devise I a sleeve or spool which shall effectually insulate all of the windings of the energizingwire from the core of the electro-magn et, and, third, to devise such a sleeve or spool as will for all duplicate sizes hold or secure an equal number of ampere-turns. I accomplish these objects with the sleeve or spool hereinafter described, and particularly pointed out in the claims at the end of this specification.

In order that my invention may be fully understood, constructed, and used by those skilled in the art, reference is had to the following specification, taken in connection with the accompanying drawings, in which Figure 1 represents in broken side and end elevational views a metallic cylinder orslceve, and Fig. 2 in similar views a nou-metallic cylinder or sleeve of slightly-greater diameter and shorter length than the metallic sleeve shown in Fig. 1. Fig. 3 represents an eleva- 3 5 tional and a crosssectional view of a washer made of insulating material, the inner diameter of which is the same as the outer diameter of the metallic sleeve or cylinder shown in Fig. 1. Fig. at represents in sectional and end elevational views my completed sleeve or spool. Fig. 5 illustrates in broken sectional view the parts as put together previous to the final steps in the method of making the completed sleeve or spool; and Fig. 6 represents a similar view showing the method in a still further advanced stage of completion, while Fig. 7 illustrates in a like View the completed article, Figs. 8 and 9 being similar views of modified forms of the sleeve or spool and Fig. 10 a side elevational view, partly in section, of a sleeve or spool of similar construction with a middle orintermediate washer.

Referring now to the drawings in detail, in all of which like letters of reference indicate like parts, A is a metallic cylinder or tube having the same internal diameter as the diameter of the magnet-core which it is to surround. B is a similar cylinderor tube of insulating material having an inner diameter equal to the external diameter of the metallic 6o cylinder or tube A and of slightly-shorter length. G is a washer, also of non-conductin g material. These parts are put together in the manner shown in Fig. 5, with one washer C on each end of the tube A, said washers resting securely against the ends of the surrounding insulating cylinder or tube B, these washers and the tube B being of vegetable fiber or any analogous insulating material capable of withstanding great heat, the tube or cylinder A being either of sheet-iron, brass, copper, or analogous metal. After the parts are put together in the manner shown in Fig.

5 the ends of the tube or cylinder A are turned down in the manner shown in Fig. 6 and afterward clinched or brought securely to bear upon the outer faces of the washers C at the opposite ends of the spool, in the manner shown in Figs. 1, 7, S, 9, and 1-0. In this way I am enabled to build up a spool for an 8c electro-magnet, such as the field-magnet of a dynamo-electric machine or electric motor,

in which the end rings 0 shall have their inner faces lying in absolutely parallel planes, the ends of the cylinder B having first been turned in a lathe to corresponding parallelism. I am therefore enabled to construct or build up in this manner a spool which will hold absolutely concentric and substantially parallel planes of wire-windinga feature of 0 great importance whereit is required to place a given number of ampere-turns upon a series of spools or sleeves of like dimensions.

In the modified form shown in Fig. 8 the washers O are of the same internal diameter 5 as the exterior diameter of the exterior or insulating cylinder B, and both the washers and the cylinders are held in place by the flanged rim of the metal tube A, as before. This is also true of the form shown in Fig. 9, except IOO that the ends of the cylinder or tube 13 are turned off in a lathe and the diameter of the washers O is slightly less than that of the cylinder B.

With the modified forms shown in Figs. 7 and 8 there is no possibility of a single winding.

I am aware that a spool has heretofore been constructed for an electro-magnet by striking up or'spinning beads on the opposite ends of metallic'tubes and then fitting non-conducting-washers or heads over the ends of the tube, andfinally turning down the outer ends of the'tube against these non-conducting washers, whereby they are held in place; but with such a structure it is not possible to preserve absolute parallelism of the inner faces of=the non-conducting washers-nor is the insulated wire of the electro-magnet protected from electric connection with the metallic sleeve two very important features which result from my improved spool.

I am also aware that a spool for winding wirehas heretofore been constructed by surrounding a metallic tube with a sleeve-of slightly-shorter length than the tube and then fitting metallic flanges over the ends of-the tube and securing them in place with addi tional or auxiliary disks by clamping or riveting the parts firmly together. Such a structure, however, is designed for an entirely nonanalogouspurpose and does not possess the features ofadvantageattributable to myspool,

for the purpose described and claimed.

'1. do not limit myself to the use of an inner metallic tube in the structure hereinafter claimed, asI may use a tube made of any material which'willpossess the necessary'binding or securing qualifications for holding the washers against the ends of the non-conducting cylinder or tube.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent of the United States, is

1. A sleeve or spool for an electro-magnet, consisting of a tube of insulating material having its ends dressed or trimmed to absolute parallelism, a pair of insulating-washers resting thereon, and an interior tube the outer ends of which are secured to the washers, whereby said parts are held firmly together, substantially as described.

2. A sleeve or spool for an electro-magnet, consisting of a metallic cylinder or tube surrounded bya non-conducting cylinder or tube held in place by a pair of non-conduct ng Washers, the ends of the inner tube being turned down against the outer faces of the washers, substantially as described.

3. A sleeve or spool for an electro-magnet, consisting of a metallic cylinder or tube, a surrounding non-conducting cylinder or tube having its opposite ends cut or trimmed to absolute parallelism, and a pair of non-conducting washers resting one on each end of said non-conducting sleeve and heldinplace by the turned-down ends or edges of the inner sleeve, substantially as described.

4. A spool for an electro-magnet, consisting of a pair of concentric sleeves or tubes,ithe inner tube being of metal and the outer'of non-conducting material, but ofless length, a pair of insulating washers or heads resting on opposite ends of the outer sleeve and'hel'd in 'place'by the turned-down ends of the inner sleeve, substantially as described.

5. A spool for an electro-magnet, COllSlStlllg of a non-conducting cylinder. or tubehaving its opposite ends cut or trimmed to absolute parallelism, a pair of non-conducting washers or'heads resting one on each end of saidtube and held firmly in place by an internal metallic tube having its opposite ends turned down or'riveted, substantially as described.

6. A spool for an electro-magnet, consisting of. two or more non-conducting tubes having their ends cut or trimmed to absolutezparallelism, in combination with three or more heads or washers of insulating material and an internal metallic tube having its opposite ends riveted or turned down against the outer faces of the end washers, so as .to hold all of the parts together, substantially as described.

7. A spool for an electro-magnet, consisting of two concentrictubes, the inner'tube being of metal and the outer ofnon-conducting ma- .terial, but slightly shorter, in combination with a'pair of non-conductingheads orwashers resting on the ends of the non-conducting tube and held in place by the end-flanged or outwardly-curved edges of the inner tube, substantially as described.

SCI-IUYLER S. 'WHEELER.

-\Vitnesses:

FRANCIS B. CRooKER, D. H. JEFFERY. 

